Circles

Gap-fill exercise

  
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
A is a collection of all points in a plane which are at a constant distance from a fixed point .

The common point of the tangent and the circle is called the .

The tangent at any point of a circle is to the radius through the point of contact.

The line containing the radius through the point of contact is also sometimes called the ‘’ to the circle at the point.

A tangent to a circle intersects it in point.

A line that intersects a circle in exactly one point is called a .

The tangent is always to the radius drawn to the point of tangency.

A is a line that intersects a circle in exactly two points.

A circle can have parallel tangents at the most.

The lengths of tangents drawn from an external point to a circle are .

Two concentric circles are of radii 13 cm and 5 cm. The length of the chord of larger circle which touches the smaller circle is cm.

A quadrilateral ABCD is drawn to circumscribe a circle. If AB =12 cm, BC = 15 cm and CD = 14 cm, then AD is equal to cm.

Distance between two parallel tangents of a circle of radius 7 cm is cm.